Mole Review

You have 392 g of CaCl₂ in your lab. How many moles of CaCl₂ do you have?

• 2.75 mol

• 3.53 mol

• 3.21 mol

• 4.35 x 10⁴ mol

You have 392 g of CaCl₂ in your lab. How many molecules of CaCl₂ do you have?

• 2.13 x 10²⁴ molecules

• 3.53 molecules

• 6.02 x 10²³ molecules

• 2.36 x 10²⁶ molecules

You have 46.00 kg of copper for your project. How many moles of copper do you have?

• 17.45 moles copper

• 63.55 moles copper

• 723.9 moles copper

• 46000 moles copper

Tags

NGSS.HS-PS1-7

Jack has 17 moles of Ag while his best friend, Jill, has 17 moles of Au. Who has more molecules?

• Jack

• Jill

• They both have the same

• No one knows

Jack has 17 moles of Ag while his best friend, Jill, has 17 moles of Au. Who has more mass in their sample?

• Jack

• Jill

• They both have the same

• No one knows

You are using 46.2 g of AgCl in your experiment. Determine the percent composition of silver in this compound.

• 0.753 %

• 50.0 %

• 75.3 %

• 46.2 %

You have a total 46.2 g of AgCl in your lab. You want to use only 13.5 g of Ag. How much total AgCl do you need?

• 13.5 g

• 46.2 g

• 75.3 g

• 17.9 g

Tags

NGSS.HS-PS1-7

Your mom kindly gave you 16.7 g of K₃PO₄ and you want to learn more about it. What is the percent composition of potassium (K) in this compound?

• 97.2 %

• 13.4 %

• 16.7 %

• 55.3 %

Your mom kindly gave you 16.7 g of K₃PO₄ and you want to learn more about it. How many grams of potassium (K) do you have in this compound?

• 3.41 g

• 55.3 g

• 16.7 g

• 9.23 g

You have found 2 samples of CClO₄ and H₂O in a cemetery. You don't like oxygen very much so you want to find the sample with the lowest percent composition of oxygen. Which sample has the lowest percent of oxygen?

• CClO₄

• H₂O

• They are the same

• I need to know how many grams of each sample I have to find this answer